Identify the correct statements about population growth.
(A) The number of deaths in a population during a given period is called mortality.
(B) Birth rate represents the number of deaths in a population during a given period.
(C) Immigration is the number of individuals of a species that have come into a habitat from somewhere else.
(D) Emigration is the number of individuals of a population that have left the habitat and gone somewhere else.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Only (A), (C) and (D)
The size of a population changes through four basic processes. Natality (births) and immigration add individuals. Mortality (deaths) and emigration remove individuals.
(A) The number of deaths in a population during a given period is called mortality. — Correct. This is the definition of mortality.
(B) Birth rate represents the number of deaths in a population during a given period. — Incorrect. Birth rate (natality) is the number of births in a given period. The number of deaths is mortality.
(C) Immigration is the number of individuals of a species that have come into a habitat from somewhere else. — Correct. Immigration brings individuals of the same species into the habitat from elsewhere.
(D) Emigration is the number of individuals of a population that have left the habitat and gone somewhere else. — Correct. Emigration is the loss of individuals who leave the habitat.
NCERT Extract:
Population Growth –
